Moistened dust spraying machine



Sept. 2, 1952 J. A. CHATER MOISTENED DUST SPRAYING MAQHINE Filed Sept.9, 1949 8 Sheets-Sheet 1 e M 6 w m J Emmi ATTOR N EY Sept; 2, 1952 J. A.CHATER MOISTENED DUST SPRAYING MACHINE 8 Sheets-Sheet 2 Filed Sept. 9,1949 mum gvwc/wim John .79. 6/70/65 ATTORNEY Sept. 2, 1952 J. A. CHATERMOISTENED DUST SPRAYING MACHINE 8 Sheets-Sheet 5- Filed Sept. 9, 1949mImlmumxmlmumumumlmxmmmnmumn-umvcmmumrmumnn-mu gwm Job/2 .fl 6/Ia fa);

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MOISTENED DUST SPRAYING MACHINE Filed Sept. 9, 1949 8 Sheets-Sheet 4 IIIII-- Job 7 .77. 66072);

ATTORN EY Sept. 2, 1952 J."A. CHATER MOISTENED DUST SPRAYING MACHINE 8Sheets-Sheet 5 Filed Sept. 9. 1949 grwonto'v John .74. Che/er,

WSWCQMLLZ ATTOR N EY J. "A. YCHATER 'MOISTENED. DUST SPRAYING MACHINE ISept. 2, 1952 s Shets-Sheet 6 Filed Sept. 9, 1949 mvl mm p hm \N .\N E TNM Wm: wm km i mm mm MM NM NM Q w M l ill I W3; W I I I! 1 I a Nv \h \mw mm g my 0 \W mm k S \m R mm 6 u N m m &

swim/rm ATTORN EY a, M C W n o J @244 swwmw Sept. 2, 1952 J. A. cHATERMOISTENED DUST SPRAYING MACHINE 8 Sheets-Sheet 7 Filed Sept. 9, 1949 3mmJo/m .19- Che/er,

w swam/M 8 Sheets-$1eet -8 Filed Sept. 9, 1949 concentrated formmay=be;.wetted toa proper extent and the wetted dust then mixed with anI air ,7 carrier Patented Sept. 2, 1952 1 t I. ,792' I 7' I t I QMOISTENED DUST SPRAYIN G MACHINE v John A. Chater, Topsham, Maine,assignor to] Food Machinery" and Chemical Corporation; V a San Jose,cane, a corporation of Delaware:

Application vSeptember 9, 1949, Serial No. 114,877

This invention relatesto a method oi and v I apparatus for producing aremedial, insecticidal or toxic; spray and projecting the same into;contact with growing vegetation, such as trees, plants or -flowers, forthe treatment of disease afiecting or destruction of insects preyingeonthe g'row'ing vegetation. More -particularly the; invention *is directedto a novel and improved method and app aratusof that character inQWhiCha toxic ,agent cornbined with aninert material-in, dust iorm is mixedwith acarrierstream of-air whereby it is conveyed to and deposited onthe plants It has heretoforebeen .a practice to project a toxic dust ortoxic liquidspray under high ,pressure directly against the plants orto'mix the 1 dust or sprayliquid with an air carrier streampof largevolumebut high pressure whereby the dust orliquidis deposited'on the plants.For reasons air and cause it to adhere to the plants. The use of awetted dust producedby introducing liquid into a carrier stream ofair,rwith which'the dust has been previously mixed, has been suggested,but this is open to-the-objection that the -'.dust

is dispersed to such an extent before being wetted that a proper mixtureof dust and liquid forthe production of a wetted dust for conveyancevand adherence to the plants cannot beobtainedz. One object of myinventionristo provide, a

,niethod and apparatus whereby these objections are overcome, andwhereby dust in a suitably e stream for conveyance :to the plants tobetreated. ,y f Another object of my invention is to provide a method andapparatus whereby streams-of the dust, wetting liquid and carrier airmay be brought together at a common aspirating and/or mixing point insuchmanner thata stream .of atomized liquid will becaused to enteran'dcomair stream, whereby the dust will be wetted to a desired degreeand dispersed in the air stream and conveyed in a properly wetted anddispersed state tor distribution to and over the plants.

Still another object of my invention is to pro,- -videmeans forsupplying the dust, liquid and air in-proper volume andat properpressures to dis.-

charge nozzles constructed and arranged in a ,45 mingle with aconcentrated dust stream and to ;be forced or drawn therewith into thecarrier I novel manner to pro zontally orterticallly' to distributethejspray to different portions oith plants. Y

,St'l; another object of my invention to prof vide an oscillatory sprayhead which'in'ay be Iaxially adjusted to differentlpositions' todischarge .-the spray at' either-side of the machine and at to spray" ure or different angles orl elevations small trees or other-vegetation. H4

Still another object of theinvention is to provide a double spray headarrangement wherein each spray head embodies a centrifugal'air blast.fan for producing afcarrier blast, which ,fans

carry the spray nozzles and are mounted so that the fan runnersaredriven rroma'jcommon en- -.tr a1 drive shaft by oppositely projectingdriven shafts about which the heads'may "be horiiontally oscillated forthe purpose described, the

arrangement and mounting of theheads being such that the heads may beadjustedto difierent working positions at the' same or difierent sidesof the machine tofspread'or vary the spray pat,- tern as described andthe arrangement further being such that in operation the heads willeliminate gyroscopic forces so that they may operate at ahighelevationwithout causing .iindue strain ontheirsupportr M With.heseandother objects in view, which .will'appear as the'nature oftheinvention is more j fullydis'closed, the invention consists of the novelmethod and steps" of the. method, and of the novel featuresofconstruction, combinationand arrangementof parts, v hereinafter: morefully (described and claimed, and as shown in the a e m nv n t w sv n hih: V. 1 o

pEig l l is -ayiew inside elevation of a spraying apparatus embodyingthe invention, parts" being omi-tted for sakeof clarity oras notessential to b ent on; r

,; 1 .:2 satop'n a w viewer the a e wit p ts mkenawarto fu y w th r prts of th p a te t V .i

Fig. 3; is; aview; in elevation of the dust and liquid hoppersshowin'githe means for-driving the agitators the --hoppers and the dustelevator and feed fan; gw i I f Fig. 4 is a-section on line 4-4 of Fig.3through the upper part of the dust hopper showing the upper portion ofthe dust conveyor, the dust agitator, the dust feeder and the chuteleading to the dust blower;

Fig. 5 is a vertical section through the mast showing the spray heads inrear elevation;

Fig. 6 isa view looking toward the inner side of one of thespray hea'dsand showing the-ram and associated means for vertically oscillating thespray heads and permitting adjustment thereof; Fi 7 s a hori ntalection-throu h thema t showing the ram and associated means for hori-Iiontally oscillating the spray heads; i Fig. 7a is a fragmentarysidelviewof them-est yiewed in the direction of the arrows 'Ia 'la inFigure 7 Fig, 8 is a top plan view on an enlarged scale showing thespray heads disposed to project spray ih one direction laterally oi themachine and illustrating the arrangement of the outlet ends of the dustand liquid supplytub'es'andthedust, liquidandair dischargenozzles; H

Fig. '9 is "a "vertical sectional view through -the'g'earbox'at theupperendof the mast,-s howing the -gearing for operating the spray headfan runners and'the mode of mounting the fan casings for adjustments andoscillating "actions clamp may consist of fixed and removable sec- Fig.'iofis a iragmentarywiew on an enlarged V "scale'of one of the spray'head "ran casings showing in section the'air dischargenozzle thereofand showing fthe arrangement -'of coacting dust "and liquid dischargenozzles relative thereto "for fproducingthe spray streams to be mixedFig. 11 is a "verticalsectional 'view through-the lowerportio'n of the'm'ast' and parts 'therein below the gear on anerilar'gedSeale,"certainparts befmgomitted; I p

V Fig. '12 *is avertical sectional view through the upperpcntion ofthemast an -enlarged scale; Fig. 13fis a detail transverse sectionon -linela -ls "of'FigJ12; v a

j'Figs. 151, 15,, "l6 and 17 "are "diagrammatic; views "showingdifferent working positions to "whic'h the spra y'heads may bes'hifted;H I I V 'Fig. "Iiiis a diagrammatic viewshowing the working parts andflow lines of the hydraulic ram mechanism for oscillating 'the sprayheads; Fig. 19 "is 'a diagrammatic view showing "the working partsiz'nrid new lines of the "means for "supplying dust and liquid to thedust "and liquid "nozzles of thespray heads for injection intoth'ecarrier airstream. 7

In carrying my invention into practice -it {provide a truck or trailercomprising a platform-l supported at a point between its center andjoneend in on wheels 2 and adapted to be coupled-"at its opposite end 1 1)ts a -motor tractor or other draft "means whereby may besupportedfatthat end and transported from place to place and moved alonga fil'd in -which the vegetation tob'e treated is'located. H

Mounted upon the platforin at or adjacentto its first-named end *is ahollow telescopic n'iast 3 including an outer-section '4 journalled atits lower'end on or rotatably connected to a gear box 5, which issuitably fixed to the frame of the platform 'l, -and journalled at aIs'uitably elevated point'in a bearing bra'cket 6,securedto-theframe ofthe platform by struts 1, wherebythe-mas't is stably supported inposition but may 'b'e oscillated about its'vertical axis.Mountedjto-rotate with and 's lidably adjustable in the ou'ter'mast-section 4 is an inner mast section 8 which carries at its :upperend a gear easing 9 :on which are tions bolted together and adapted whenunited to hold the mast section 8 in any position to which itmayIce-adjusted. In order to raise and lower the'section 8 and the partscarried thereby,

which are more or less weighty, a raising and lowering deviceis providedin the form of a winch comprising cables I3 fixed at one end to atransverse shaft M on the platform frame and thence passing upward inengagement with a lower set of guide pulleys I5 on the mast section 4and thenceover an upper set of guide pulleys 'I-E'oh "the mastsection 4and through slots '11 in said outermost section 4 to the interiorthereofarrd depending therefrom and secured at their other ends to thebottom 8a. of the -mast section 8. On the'shaft I4 is a hand crank l3whereby the shaft l'4 may be rotated to wind or u'nwindth'e cables; whenthe clamp I2 is released, to raise the mast 'section -8 orallow it tobelowered in "a controlled manne'r by gravity. A holder 'I'S may beprovided i'n'the platform frame with which the crank "handle maybeengaged to 'holdthe shaft 14 from rotation to temporarily maintain them'astsection 8 in an adjusted position while theclanip'l-Z is beingfastened or released. Any other means "for holding the winch stationarymay, however, :be used, and any other suitable means in place of thewinch 'may'be employed to 'raise and lower the adjustable mast section.

The spray heads I0 and H are arranged in axial alignment opposite eachother and at 'diametri'cally op'posite'side's of the mast center. Each"consists of a centrifugal fan casing 20 and 2). runner '2 I, the casinghaving at its outer side flan Iair-inlet'22 guarded by a screen '23andbein'g provided at-a point in its periphery withan out"- let "24 fromwhich 'extend's a sector shaped, fan'- shaped or outwardly flarin'gshallow nozzle '25 partitioned -:totprovide a plurality "of channels 25'arranged 'side'by side to discharge streams of ail over 'ah'omparativelywide area. These streams of -air,- supplied in-Iarge volume, but atlowpressure, are combined on ejection to serve as a care rierfstream forconveying the wetted dust in the form of a spray of dust and liquid tothe plant's to betreated. Supported by the air discharge 'nozz'le oneach fan casing is a transverse series of dust discharge nozzles 26,connected to flexible diist supply pipes 2-1, and also supported by theair discharge-nozzle of each *fan' casingare head 'ers28 "eachcarryingatransvers'e series of liquid discharge nozzles 29, whichheadersareconneted t'o flexible liquid supply pipes 30. 'rhe'nozzies zt,"26 and?!) ares'o arranged that their tips li'e' in close proximity,with each dust discharge noz'zle 2 6 'disp'os'ed between the air'discharge n'o'zzle ii: and a li'quid "discharge nozzle 29, and "with the:nozzles '26 and '29 disposed at "an 'ang leto tl'ie no'zzle 2 5. Thisangular disposition is or maybe such as "shown particularly in Fig. 10,that the atomized streams of liquid issuing 'from the nozzles 2'9 willbe projected toward, across and throughthe :more orle'ss concentratedstreams of :dust issuing from the nozzles 2t and pass there that thedust particles will be mixed 'withliquid before they are undulydispersed by and in the current'of air, and the wetted dust particleswill be uniformly mixed with and more or lessuniformly dispersedthroughout the current of air. As a result, a mixture of a desiredvolume and consistency of the active agent or agents will be producedwhich is adapted to be conveyed by'the carrier air stream toward anddeposited on the plants so as to adhere to the plants to subject thesame in a most highly efficient manner for treatment of diseaseordestruction of insect life, thus avoiding the objections named withrespect to prior methods of producing and employing a treatment spray inwhich dust is used as an ingredient.

The dust employed may be an inert dust (a non-chemical dust or-anon-toxic dust) mixed with a powdered toxic agent, or it may be achemical 'or insecticidal dust mixed with a toxic agent, or a chemicalor toxic dust may be used in connection with an insecticide wettingsolution acting in conjunction with the dust toproduce a treatment sprayof a proper kind and potency. The liquid employed may be a solution ofwater and a wetting agent, or such a solution containing also a toxicagent, or it may consist of a simple toxic solution or plain water. Inthe present instance it may be assumed that the liquid consistsof asolution of water and a wetting agent. I do not,

however, limit myself in these particulars or to the particular anglesat which the dust and wetting liquid streams are projected for acommingling action with each other and with the air stream so long asthe defined method of delivering dust and liquid in the describedcondition to the carrier air stream is preserved.

While a single spray head may be used in a small capacity machine, Ipreferably employ a 'pair of spray heads because of their wider range ofusefulness and because of certain other advantages which are obtained.As before stated, each of these spray heads is of centrifugal fan typeand comprises a casing 20 and a runner 2i therein which are arrangedabout a horizontal,

hollow runner drive shaft 3|, the shafts'3l of the two spray heads'beingarranged about stationary shafts or supporting arms 32, and the shafts3! being journaled at their inner ends in bearings 33 interposed betweenthe shafts 3| and 3t and 32 are arranged at right angles to the sleeveand concentric with each other at opposite sides of said sleeve 35 andat equal distances beyond the axial center of the mast. Bearing rings 36mounted on the casing 9 and carrying antifriction bearings 33' engagedby supporting rings 31 on the fan casings form supports for the innersides of the fan casings which are supported at their outer ends bybearings 38 carried by the screens 23 on the extended outer ends of theshafts or arms 32, whereby the fan casings are mounted to permit-them tobe axially adjusted and vertically. oscillatedin a manner hereinafterdescribed. The sleeve is disposed in the casing 9, above a spray headcarrier sleeve 33' suitably secured within the bottom of the casing 9and detachably coupled by a bearing and coupling member39' to the upperend of the mast section 8, whereby the, spray head section as a whole'issupported and is adapted to'be vertically adjusted by'raising andlowering the mast section 8, es

hereinbefore described.

The gearing which drives the fan runners 2| comprises bevel gears 40 ontheinner ends ofthe shafts 3!: which mesh with abevel gear 4| arrangedtherewith inthe casing 9. Gear 4| is mounted upon the upper end of ashaft 42 di sposed in the sleeve 35. and member 39 and journaled at itsupper end: in-a bearing 43 in the sleeve 35 and adjacent its lower endina bearing 43'v in the member .39 and extending at its-lowerendbelow-the. sleeve 39 and into the upper end of the mast section 8.Within the mast is arranged a telescopic transmission shaft comprisingan upper shaftsection144 which, is fitted toslide withinand feathered torotate with a hollow lower shaft section'45. The shaft section 44 has astep bearing 4'6 at its upper end receiving the lower end of the shaft42, while the shaft section 45 is coupled at its lower'end, as at 41, toa short shaft 48 in the gearbox 5, whereby the telescopic shaft and the.runnerdrive ,shafts are adapted to be driven to operatethe fan; runners.The telescopic shaft section, 44 is adapted to slide with the mastsection 8 in its vertical adjustments sothat in any. position to whichthe spray headsmay be raised and, lowered the'fan runners may be driven.Journaled in the gear box 5 is a short horizontal shaft 48'-which isconnected to the shaft. section-.48 by bevel gears 49, 50-.and

coupled, as at-5I, to the forward end of a main driving shaft 52suitably driven-from the shaft of amotor 53 mounted upon the rearportion of the platform I. Any suitable controlling means maybe providedto throw the shaft 52 into and out of action. and to control theoperation of the motor .and the driven speed of the fan runners.

The means for horizontally oscillating the spray heads may be of anysuitable type, but as showncomprises a pair of ratchet disks 154, 55fixed: to the mast section. 4 above and'belowa spacing disk 56 journaledfor. free rotative movecarryingpivoted; spring controlled pawls 51., 51'

to engage the teeth of the respective ratchet disks to rotatethe disksand the mast to which theyare aflixed in opposite directions in anobvious manner." To the ear 56' is connected the piston rod of ahydraulic ram 58 arranged in a liquid supply circuit including apressure pump 59, driven through'a'transmission 58 from the main drive 1while reciprocally moving the piston rod of the ram 58.

The means for vertically oscillating the spray heads may also'be of anysuitable type but as ifegaowzaa shown comprises "a sproket link be'lt,Lband .:-.or straphonnection Gil ezr'rbraeing the periphery 2101: 'thecasing '9 "and "embodyinga: pair of 1 sprocket chain? Gfi'dfififlhdetachably secured at vzone end to he sprocket Tings-31 and engaginglsprocket te' 7 6 l on the" rings and -having' theirropposite "of'ffr'ee'ends detachab'ly -connected to a1::rod'-62 "eouiiled to 'the' piston:rod of a hsldraulicrram 63 supported by the-casing a or otherwise.atrthetop "ofthema'st. The'ram isarr'anged in ahydraulic supply circuitconnected witht therpumpi waand "'iiormally' holds the fan casingsagainst-rotation "in aposition-inwhich the' nozzlesi 25; 2.6,?29; and"other weighting par ts carried' thereby .arezdisposed i-n theirz'no'rmal woikingtpositionn-asi remares their level-ofprojection:from'zthe fan casing. onedirectiomof motionztheram operatesito rotatethe-fan casingssowas:to swing'the nozzles upwai dly. I In its xoppositedirection of -motion the ram'operat'es to rotateithefamcasings --s'o asto swing -=the -noz'zles downwardly, or -=to low the par-ts to retur nto normal :position :by gravity. =-'By'- this meansi the'ispray headsmaybe 's'cillated vertically' to' sprayirup and down within r quired. Thefreeendsiofithe chainsmay berde- ""talohed fr'onr thex rod: (SQ-randthe:other :endsof th'e chains detached fromfthe.sprocketirings 3iz-to-allow-"relative rotative adjustments :of fthezzfan casings to' disposetheir nozzles in 'varyingvworking positions' in which they:may:beiihe1d:by-wrefastening the; en'ds oifithe chains:toi'thei'rodizmd to the; sprocket rings 31.

The fan casings 'are normally theld .toiidisnose *atheir nozzles in 7adesired workingzzposition. or;

*positions by the"be'1ti or. band'ilifl; but :arer-rotatably:adjtistableab'out their-,axes to: dispose: the nozzles' in'idifierent :pos'itions'toiprojece' the :spray now-aid, downward: or in either; direction;:l'aterari n of the machine. -"Figs. -14, l5; 16:..and;1.7i;efor.;

example, :show some: ofi these adjustments. .1 1n 'Figi 14':- 'thefanicas'ings .arershown: as L arranged project the-tspraysat't:difierent high; and-slow evels beyondione side:ofithe machine.;-Fig.:15

fi-s'hows the-fan casings adj usted ztozi' project." .the

l'spra'y -"at a low :leyel tbeyondiopposite.:sidesiof the machine. Fig.lfilshows the ffanscasings ad- 1 justed'ztoproje'ctithespray ata' high:level beyond i 'opposite sides of the. machine. Fig: 1'71 showsxthe .2fancasing'adj usted-tofpr'oj ect Lth :spray vertically upward-iniparallel' streams. :JiIt tie ;to'; berun'der stoodfro'm.theseiillustrationsithat;thetwo spraysse'rs imayi be adjusted: inthezi sameaor .idifiere'nt directionsi'ito 13116? Some or idifierent.degrees so thaiffithey'maybothidisch'argev upwardly-or downsides-i .off the machine; at? the-*- same;:or; different :levels; -the advantages:tof which :for: ithe: peri*-formance ofvariousispra'ying operationswillsbe readily understood. :1 These adjustmentsvmay; be effectedby-releasingrthe link beltBll :whiclrhdlds #the fan casings stationary;then" turning T011501 the'-other orboth, oi" thefancasings .toarthe P'desired'position-or' positions of .adjustmentsand their refastening:the *ends of .the belt members given radiuswherrithisi-mannemof:sprayingzis supports; :E 'i@ I1'@n mn L e w zs raying ttoabezdonesata-higher level than usual and ladiustment: of t ie fi ne in he m nneidescribedxt velyv th vi e t eti fi d 10 g orveleyatorefi 5 thereinpassing around pulleys on shafts fi'fi Tandem; shaft=6 1- being driven,bytgeab ing 68 from a- .shaft -;69 .driverrby gearing, '10} from themainidriyeshaft. 'l-his -conveyor picks-up the -dustpfrom: the hopper.andsconveys. thesame to 5 -.a ;-primary ifeedsbox :1 l co ntaining an..agitator ior stirrer :12 .which. breaks a, up.- any .lumpsandreduces-the; dust torauniforn ly fine state. .The agitator ismounted-sontheshaft 86 ,on,..which is =a-lsomountedaan. evenefeed fan13;. operating int a.-.secondaryfeed. box or. :casing ..H;,eomrnuni--cating-. :With the, feed. ,box I I; andinto which. the dust is v fed.and drawn-by. the. action of the ,agi-

tator and the feed fan. From the feeder-lien casing thedustpassesthrougha ductl-l l' to a blower J 5. drivenhy gearing 16 from the maindriveshaft. The .blower. casing .is. proyidedivith a =-p1 urali. ty ofperipheral outlets; with which ,the -inlet. ends ofthel pipes .2'l-.a re.connected,,\vhich .pipes lead .;.therefrom.-to -..the,..nozzles.;2 fi.The

q fan. blows. .the dust. through ,these, pipesand the .dustissuesirom.thenozzlespzfi. i-n thenforrn of ,.,conc entrateddustsstreams.

: The; means. or,..supp1ying..1iquid "to the, liquid atomizing .nozzles,comprises .a. tank 111 to @contain watenor. other suitable, liquid orsolution -as..hereinbeforedescribed. L This tank communi- ..cates-.withv.a .pressurepump, 12L driyen by gearing .79.i1'om the ,mainshaft,,.and. with the putletiof. which connectthe pipes, 3(Lleading to;the

manifold .pipes. to which] the liquid spray nozzles .29 are.connected,whereby. the liquid at thedesired pressure is, supplied tosaid nozzles;Mount- ;ed. upon the tank are .sh'afts :19 89', 8 l carryingsprocket,,ge ars, about which are trained adriye chain,82. On jheishafts19, 811 within the; tank are -:mounted. agitat r 13a. BM of v suitabletype. 1 .ShaftijB i receiyesiits motion. from the punin 'm whereby.when: the pum is .i p et ont s tators will; also be operated.

"Eigs. .18.,. and 19. "show diagrammatically but -..g1:eeter1 deftai1'the parts of the hydraulic ram .driying; andgliquidno zzle supplysystems. As showmin Fig; "'18, ,:the rams ,are arranged in l a hydrauliccir.cnit1 i ncludi ng sets. of feed and returnflines; 82,183,;83; 83, aliquid reservoir 54, pressure. :regL11ato1".8 5, and valves $86, 81, 88

andL-89 suitably. a ran ed contro he. su p y en gma my the, ramsmss show.in. Eisie the pump 28 iswconnee tedhyan intake pipe 30, con- .;taini11g..a. control ,valve: filhwithhthe tank l1, and by a, discharge spine.92, containing a pressure s .regulator. 93, a controlva1-ve .$4, and,-a cushion chamber. 95... .With the .liquid supply ,pipes, .30:leadingto-the, nozzles 29. I

sFromrthe foregoing description, ,takeninconlnection. with the; drawingsithe .method of formandprojectingthe ,spray and the construc-,....tion.. and..mode,-of ,operation of, the apparatus lembodyinamy.invent-ion, ,willbe readi1y.under- .lstoodswithout. a. further... andextended descrip.

tion andlitl.Wi1Lybe iseen. that my. method of producing. and projecting; the spray-1 overcomes .sthe specified, objections. to previouswetted dust ,spr-ay methods and. secures the tadyantages herena fi lafoth... :Also. it .w1111 be Seen that iiiy invention provides an apparatuswhereby direct or sweep spraying at different levels and in onedirection or in different directions simultaneously may be performed todeposit the spray in an optimum condition and in a most eflicient manneron the plants.

It will, of course, be understood that the steps of the method, andconstruction and arrangement of the parts of the apparatus, may bevaried within the scope of the appended claims without departing fromthe spirit or sacrificing any of the advantages of the invention.

I claim:

1. A plant spraying apparatus comprising a spray-head having means forprojecting into the atmosphere for admixture an air carrier stream,liquid spray streams, and concentrated dust streams, said meansembodying a fan having a comparatively wide, shallow-depth dischargenozzle for producing and projecting an air carrier stream of largevolume at low pressure, a plurality of liquid spray nozzles arrangedlongitudinally of and side by side transversely of the air dischargenozzle, a plurality of similarly arranged dust nozzles disposed betweensaid liquid spray nozzles and the shallow-depth discharge nozzles, thenozzles being arranged axially to discharge their streams in the samegeneral direction, the spray nozzles being positioned closely adjacentthe dust nozzles and directed at relative angles such as to causemergence of the streams and to cause an inter-mixture of the spray anddust streams at or just prior to their mergence with the air stream,means for supplying liquid under pressure to the liquid spray nozzles,and means for supplying streams of dust in a substantially concentratedstate to the dust nozzles.

2. A plant spraying apparatus comprising a spray-head having means forprojecting into the atmosphere for admixture an air carrier 10 stream,liquid spray streams, and concentrated dust streams, said meansembodying a fan having a comparatively wide and shallow discharge nozzlefor producing and projecting an air car- I rier stream of large volumeat low pressure, a

plurality of liquid discharge nozzles extending longitudinally of theair discharge nozzle adjacent its outlet, a plurality of similarlyarranged dust discharge nozzles located between the liquid dischargenozzle and the shallow-depth discharge nozzle, said liquid andshallow-depth discharge nozzles being arranged at such angles relativeto each other and to the dust nozzle as to cause mergence of the streamsand mixture of the spray streams with the dust streams at or just priorto their mergence with the air stream, means for supplying liquid underpressure to the liquid spray nozzles, and means for supplying streams ofdust in substantially concentrated form to the dust nozzles.

J GEN A. CHA'I'ER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,503,159 Haywood July 29, 19241,652,732 Root Dec. 13, 1927 1,948,668 Kuchler Feb. 27, 1934 1,993,635Towt Mar. 5, 1935 2,220,082 Daugherty Nov. 5, 1940 2,221,434 Pitner Nov.12, 1940 2,222,598 Arnold Nov. 26, 1940 2,223,672 Callihan Dec. 3, 19402,238,120 Launder Apr. 15, 1941 2,315,096 Sanderson et a1. Mar. 30, 19432,454,339 Potts et a1. Nov. 23, 1948 2,500,816 Gird Mar. 14, 1950

